Insulator.



No. 740,314. PATENTED SEPT. 29',

0. B. & J. J. ROBERTSON.

IN SULATOR. APPLICATION IILED JAN. 12, 1903.

I0 MODEL.

q vmmao UNITED STATES Patented September 29, 1903.

PATENT- OFFICE.

CHARLES B. ROBERTSON AND JOHN J. ROBERTSON, OF OTTUMWA, IOWA.

INSULATOR.

SPECIFICATION forming part of Letters Patent No. 740,314, datedSeptember 29 1903. Application filed January 12,1903 Serial No. 138,720.N model) To all whom it may concern:

Be it known that we, CHARLES B. ROBERT- SON and JOHN J. ROBERTSON,citizens of the United States, residing at Ottumwa, in the county ofWapello and State of Iowa, have invented certain new and usefulImprovements in Insulators; and we do hereby declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same, reference being had to the accompanying drawings, and to theletters and figures of reference marked thereon, which form a part ofthis specification.

Our invention relates to insulators for electric line-wires, and has forits object a device of this kind which will permit the wire to beconnected to the insulator without the use of any tie-wires. I

- A further object is to provide an insulator to which a wire may bereadily connected and which will be securely held thereby.

Our invention is shown in the accompanying drawings, in which- Figure 1is a front elevation. like view taken at right angles to Fig. 1. 3 is atop plan View.

Referring specifically to the drawings, 5 indicates the body portion ofour insulator, which has a threaded socket 5, by which it is screwed onthe usualinsulator-peg. The head 6 of the insulator has a vertical slotor groove 7 extending from the top downward a suitable distance. Avertical opening or slot Fig. 2 is a Fig.

8 is also formed in the head across the slot 7. The top or bottom of theopening 8 forms a bed or seat for the wire W. The slot 7 and opening 8extend entirely across the head and are connected by an inclined passage9, extending upward from the bottom of the slot 7 to nearly the top ofthe opening 8. Below the slot and opening we form a groove 10 for atie-wire in case it is desired to use one, but which is usually notnecessary.

In use the insulator is screwed down on the peg within a quarter-turn ofbeing tight. The wire is then placed in "the slot 7 and passed throughthe passage 9 into the opening 8, the insulator at the same time beingscrewed down to its final resting position. It is then impossible forthe wire to leave the slot 8 unless the insulator is turned back. Theinsulator can be hung in any position, and the wire will be securelyheld in the top as well as in the bottom end of the slot 8.

Having thus described our invention, what is claimed as new, and desiredto be secured by Letters Patent, is

An insulator having a vertical slot in the head thereof, a verticalopening in the head at an angle to said slot forming a seat for thewire, and a passage extending upward from the bottom of the slot to thetop ofthe opening, substantially as described.

In testimony whereof We affix our signatures in presence of twowitnesses.

CHARLES B. ROBERTSON. JOHN J. ROBERTSON.

Witnesses:

ROBERT C. CORBUS,- E. J. LAMBERT.

